diff --git a/build-constraints.yaml b/build-constraints.yaml
index 3afe624a..463351b8 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3336,7 +3336,7 @@ packages:
         - mixed-types-num
         - cdar-mBound
         - aern2-mp
-        #  - aern2-real
+        - aern2-real
 
     "Bartosz Nitka <niteria@gmail.com> @niteria":
         - oeis < 0 # via test-framework